J/MNRAS/453/4020 ATLAS 1.4GHz Data Release 3 (Franzen+, 2015)
ATLAS. I. Third release of 1.4 GHz mosaics and component catalogues.
Franzen T.M.O., Banfield J.K., Hales C.A., Hopkins A., Norris R.P.,
Seymour N., Chow K.E., Herzog A., Huynh M.T., Lenc E., Mao M.Y.,
Middelberg E.
<Mon. Not. R. Astron. Soc., 453, 4020-4036 (2015)>
=2015MNRAS.453.4020F 2015MNRAS.453.4020F (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Galaxies, radio ; Radio sources ;
Radio continuum
Keywords: methods: data analysis - catalogues - surveys -
radio continuum: galaxies
Abstract:
We present the third data release from the Australia Telescope Large
Area Survey. These data combine the observations at 1.4GHz before and
after upgrades to the Australia Telescope Compact Array reaching a
sensitivity of 14µJy/beam in 3.6 deg2 over the Chandra Deep
Field South (CDFS) and of 17µJy/beam in 2.7 deg2 over the
European Large Area ISO Survey South 1 (ELAIS-S1). We used a variety
of array configurations to maximize the uv coverage resulting in a
resolution of 16 by 7-arcsec in CDFS and of 12 by 8-arcsec in
ELAIS-S1. After correcting for peak bias and bandwidth smearing, we
find a total of 3034 radio source components above 5σ in CDFS,
of which 514 (17 per cent) are considered to be extended. The number
of components detected above 5σ in ELAIS-S1 is 2084, of which
392 (19 per cent) are classified as extended. The catalogues include
reliable spectral indices (Δα<0.2) between 1.40 and
1.71GHz for ∼350 of the brightest components.
Description:
ATLAS covers two regions, each of ∼3 deg2, surrounding CDFS
(RA=03:30:16.3, DE=-28:05:12.4) and ELAIS-S1 (RA=00:33:50.8,
DE=-43:44:57.4). These two fields have previously been observed at
1.4GHz as part of the ATLAS project and are described by Hales et
al. (2014, Cat. J/MNRAS/441/2555). Both of these fields were
originally targeted for radio observations as they overlap with SWIRE
which includes infrared and optical data for the majority of the radio
objects.
ATCA project C1967 was allocated 1000h distributed over 78d between
2009 June and 2010 June to extend ATLAS.
Previous ATLAS DR2 observations (ATCA Project IDs C1035 and C1241)
from Hales et al. (2014, Cat. J/MNRAS/441/2555) were combined with our
CABB observations to maximize the sensitivity.
The data were combined in the image plane for reasons related to
bandwidth smearing, and described in detail in Section 3.2. These data
consist of two 128MHz bands centred at 1344 and 1432MHz each
containing 16 channels of 8MHz in size. Both bands were imaged
together using a similar procedure to the CABB data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
atlasdr3.dat 211 5118 ATLAS DR3 Component Catalogue (23/07/2015)
(coverage area: 6.296 sq. degrees)
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See also:
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
J/A+A/451/881 : ESIS BVR catalog, ELAIS-S1 (Berta+, 2006)
J/A+A/544/A38 : ATLAS 2.3GHz observations of ELAIS-S1 & CDF-S (Zinn+, 2012)
J/AJ/135/1276 : ATLAS radio observations of ELAIS-S1 (Middelberg+, 2008)
J/MNRAS/441/2555 : ATLAS 1.4GHz Data Release 2 (Hales+, 2014)
Byte-by-byte Description of file: atlasdr3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- ID Component identification number (1)
10- 16 A7 --- --- [ATLAS3_]
17- 33 A17 --- ATLAS3 Component IAU name (JHHMMSS.s+DDMMSSC) (2)
35- 36 I2 h RAh Intensity weighted centroid
Right Ascension (J2000)
38- 39 I2 min RAm Intensity weighted centroid
Right Ascension (J2000)
41- 45 F5.2 s RAs Intensity weighted centroid
Right Ascension (J2000)
47 A1 --- DE- Intensity weighted centroid
Declination sign (J2000)
48- 49 I2 deg DEd Intensity weighted centroid
Declination (J2000)
51- 52 I2 arcmin DEm Intensity weighted centroid
Declination (J2000)
54- 57 F4.1 arcsec DEs Intensity weighted centroid
Declination (J2000)
59- 67 F9.6 deg RAdeg Intensity weighted centroid
Right Ascension (J2000)
69- 78 F10.6 deg DEdeg Intensity weighted centroid
Declination (J2000)
80- 83 F4.2 arcsec e_RAs Error in right ascension (3)
85- 88 F4.2 arcsec e_DEs Error in declination (3)
90- 94 F5.3 mJy/beam rms Local rms noise level
96- 99 F4.2 --- BWS Local bandwidth smearing correction
(see Section 3.2)
101-105 F5.3 GHz ObsFreq [1.378/1.521] Effective observing frequency
at source position in mosaic
(see Section 4.5)
107-113 F7.3 mJy/beam Sp Peak flux density at ObsFreq (4)
115-120 F6.3 mJy/beam e_Sp Error in peak flux density at ObsFreq
122-128 F7.3 mJy S Integrated flux density at ObsFreq (4)
130-135 F6.3 mJy e_S Error in integrated flux density at ObsFreq
137-145 F9.3 mJy/beam Sp1.4GHz Peak flux density at 1.4GHz (5)
147-152 F6.3 mJy/beam e_Sp1.4GHz Error in peak flux density at 1.4GHz
154-161 F8.3 mJy S1.4GHz Integrated flux density at 1.4GHz (6)
163-168 F6.3 mJy e_S1.4GHz Error in integrated flux density at 1.4GHz
170-175 F6.1 arcsec Deconv ?=-999 Deconvolved angular size (7)
177-182 F6.1 arcsec e_Deconv ?=-999 Error in deconvolved angular size (7)
184 A1 --- Class [P/E] Component class
(P = point-like; E = extended)
186-193 F8.3 --- Sindex ?=-999 Spectral index between
1.40 and 1.71 GHz (8)
195-202 F8.3 --- e_Sindex ?=-999 Error in spectral index (8)
204-211 A8 --- Field Field identifier
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Note (1): A prefix indicates the field in which the component lies:
'CI' and 'EI' stand for Stokes I component in CDFS and ELAIS-S1, respectively.
Where multiple Gaussians were fitted to complex components, the component
number is appended by the letter 'C' followed by the Gaussian number.
Note (2): Component IAU name given by ATLAS3 JHHMMSS.s-DDMMSSc, where the letter
'C' stands for component in Stokes I. Norris et al. (in preparation) compiles
the ATLAS DR3 source catalogue by combining the source components.
Note (3): Errors in positions are derived as described in Section 4.6.2.
Note (4): Error is derived as described in Section 4.3. S is set to Sp and
e_S to e_Sp for sources classified as point-like.
Note (5): Sp1.4GHz was derived from Sp as described in Section 4.5.
Note (6): S1.4GHz was derived from S as described in Section 4.5.
Note (7): Relevant for extended sources.
Deconv and e_Deconv set to -999 for point sources
Note (8): as measured in Section 4.4. Relevant for sources with high SNR.
Sindex and e_Sindex set to -999 if SNR too low for spectral index to be
measured.
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Acknowledgements:
Thomas Franzen, thomas.franzen(at)curtin.edu.au
Curtin Institute of Radio Astronomy
(End) Thomas Franzen [CIRA], Patricia Vannier [CDS] 08-Apr-2016